2KT 



DAPTINUS, Cope. 



Tliis gcims was proposed for Saurocephalus phlehotomus, Cope. TIk; (oiiii 

 of the crowns ol' 1 he tcelli is {\n\{ ot' Saurocejfhaliis and Erisichlhc; l)ii( if 

 differs from tlie lattcjr in llicir perfect ecpiality of size. It differs from the 

 fomier in the position of the nutritious foramina of the inner si(h; of the 

 dcntary hone; for, instead of forming an isohited series, as in tha( genus, tliey 

 only appear as notches on the inner margins of the alveoli. 



The mode of articulation of the premaxillary and maxillary hones wilh 

 each other and with the prefrontals is similar to (hat already descrihcd in 

 the genus Portheus. The maxillary underlaps the premaxillary on its inner 

 face, forming a very extensive squamosal suture, and pres(!nts the two superior 

 condyles, the anterior for the ethmoid, the posterior for the palatine hones. 

 The palatine presents the malleolar segment which connects the maxillary 

 ami prefrontal articular faces, and then continues downward and hackward, 

 as a vertical lamina, without teeth on its free margin. Immediately in front 

 of eacli of these hones is a triangular element, compressed, with an acute 

 apex upward and truncate base downward, the posterior border in contact 

 with the anterior edge of the palatine. The vomer is toothless. 



The anterior vertebrae present pits tor the neurapophyses, l>ut no others, 

 as far as the third. On the fourth and subsequent c(;ntra, tlicrc is a deep 

 lateral pit, and a smaller one above and behind it, near, and a little posterior 

 to the neurapophysial pit. 



The teeth in Daptinus arc not a little like tliose of the existing genus 

 Fomatoimts, which includes the bluefish. 



Daptinus pulebotomus. Cope. 



Represented by all the tooth-bearing elements of three individuals, from- 

 distinct localities, with portions of crania and vertebra'. These show that 

 the jaws are long and slender, and that the teeth are closely set, and with 

 the roots l)ut little compressed, while the crowns are very much so. Eight 

 alveolae may be counted in fourteen millimeters. The dentary bones have a 

 vertical and transverse truncation at the symphysis, and are thickened so as 

 to afford strong attachment for something ; the absence of the usual oI)li(juity 

 in the one or the other direction is noteworthy. The teeth continue to the 

 symphysis, but of slightly reduced size. The internal groove of the dentary 



